ReScript, a fully typed JavaScript alternative


ReScript is one of many emerging programming languages ​​that help web developers build complex web applications that can be transpiled into JavaScript and run in the browser.

The use of JavaScript has changed dramatically over the past 25 years. However, as the language continues to evolve, it struggles to provide the capabilities required for the complex applications that are being developed these days.

Languages ​​like ReScript and TypeScript fill in the gaps that exist in JavaScript and help developers build more robust applications that can still run in the browser through JavaScript transpilation.

TypeScript has quickly become the dominant player in the field providing a convenient migration path from JavaScript that relies on the fact that TypeScript is a superset of JavaScript, meaning that code written in JavaScript is TypeScript code. valid – making the migration process as easy as renaming a file. Developers can slowly add functionality specific to TypeScript (such as type definitions) without requiring a complete rewrite of the application.

ReScript, on the other hand, only covers a subset of JavaScript, which allows it to maintain a lightweight syntax that is easy to learn, and helps developers avoid many of the pitfalls that JavaScript (and, therefore, TypeScript) includes. .

This means that the migration to ReScript is more difficult. Nonetheless, ReScript code is generally easier to read and maintain, generates optimized and readable JavaScript code, and provides an incredibly fast compiler that is taught to be an order of magnitude or two faster than the alternatives.

The easiest way to get started with ReScript is through the online playground which allows developers to experience ReScript without going through a local installation.

To set up a new ReScript project, developers are advised to clone the official template project, install dependencies and build script:

git clone
cd rescript-project-template
npm install
npm run build
node src/

It is also possible to add ReScript to an existing project by following a short guide.

Finally, ReScript comes with built-in support for JSX and ReactJS which can easily be installed using the following guide

ReScript is available through the Github repository and is released under the MIT license. Developers are encouraged to contribute and provide feedback to the project by following the contribution guidelines and code of conduct.

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